645131102116 has 12 divisors (see below), whose sum is σ = 1132586393932. Its totient is φ = 321534989568.

The previous prime is 645131102113. The next prime is 645131102129. The reversal of 645131102116 is 611201131546.

It can be written as a sum of positive squares in 2 ways, for example, as 298509249600 + 346621852516 = 546360^2 + 588746^2 .

It is not an unprimeable number, because it can be changed into a prime (645131102113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257638965 + ... + 257641468.

Almost surely, 2^645131102116 is an apocalyptic number.

It is an amenable number.

645131102116 is a deficient number, since it is larger than the sum of its proper divisors (487455291816).

645131102116 is a wasteful number, since it uses less digits than its factorization.

645131102116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515280750 (or 515280748 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 645131102116 in words is "six hundred forty-five billion, one hundred thirty-one million, one hundred two thousand, one hundred sixteen".